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a in (-oo:+oo)
(3/5)*a-((1/2)*a) = 9/2 // - 9/2
(3/5)*a-((1/2)*a)-(9/2) = 0
(3/5)*a+(-1/2)*a-9/2 = 0
1/10*a-9/2 = 0 // + 9/2
1/10*a = 9/2 // : 1/10
a = 9/2/1/10
a = 45
a = 45
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